Minerals, Metals, and Other Materials

Rocks and Minerals

How is the value of a diamond determined?

Demand, beauty, durability, rarity, freedom from defects, and perfection of cutting generally determine the value of a gemstone. But the major factor in establishing the price of gem diamonds is the control over output and price as exercised by the Central Selling Organization’s (CSO) Diamond Trading Corporation Ltd. The CSO is a subsidiary of DeBeers Consolidated Mines Ltd.


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